Viewing archive of Friday, 29 December 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2017 Dec 29 1230 UTC

SIDC Forecast

Valid from 1230 UTC, 29 Dec 2017 until 31 Dec 2017
Solar flares

Quiet conditions (<50% probability of C-class flares)

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

10cm fluxAp
29 Dec 2017071007
30 Dec 2017072007
31 Dec 2017074010

Bulletin

Solar activity was low, no C-class flares in past 24 h. There are no active regions visible on the solar disk. A CME was observed in LASCO-C2 starting at 23:12 UT on 28 December, directed towards the south east and associated with a B8.3 flare (peak 22:29 UT), behind the east limb. This CME is backsided and will not affect the Earth. No C-class flares expected (although this region behind the limb may change the situation).

Proton flux levels are at background values and are expected to remain so. No Earth-directed CMEs were observed.

Solar wind speed is at 400 km/s with interplanetary magnetic field magnitude of 5 nT. Geomagnetic conditions have been quiet, and expected to remain so. There is a small positive coronal hole located at 30 degrees northern latitude which may affect the Earth in 48h, but its effect should be minimal.

Today's estimated international sunspot number (ISN): 000, based on 14 stations.

Solar indices for 28 Dec 2017

Wolf number Catania///
10cm solar flux071
AK Chambon La Forêt010
AK Wingst006
Estimated Ap005
Estimated international sunspot number000 - Based on 29 stations

Noticeable events summary

DayBeginMaxEndLocStrengthOP10cmCatania/NOAARadio burst types
None

Provided by the Solar Influences Data analysis Center© - SIDC - Processed by SpaceWeatherLive

All times in UTC

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